Operating System (OS)
Which is the layer of a computer system between the hardware and the user program

System environment
None
Operating environment
Operating system

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Operating System (OS)
The Register - to - Register (RR) instructions

which perform indicated operations on two fast registers of the machine and leave the result in one of the registers.
All of these
which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, except in the case of store operation when it is also
have both their operands in the main store.
None of these

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